pygame midi 读取PC(程序更改)消息 [英] pygame midi read PC (program change) messages
问题描述
我的目标是聆听连接到我的吉他踏板切换器的 MIDI 转 USB 适配器.当收到程序更改，(PC)消息时，播放相应的 mp2 文件.
我尝试了许多不同的 Python MIDI 模块，而 pygame 是我最接近的.
下面是我一直在修改的代码，当我为踏板切换器发送程序消息时，它正在打印消息.我只是不知道如何提取和解释我需要的东西.
例如，踏板切换器发送 PC 消息 MIDI Chnl 3, Program Change 1
我的代码，
print(转换)退货，
,<事件(34-未知{'状态':61，'数据1':247，'数据2':0，'数据3':0，'时间戳':4674，'vice_id':3})>] 或者，MIDI Chnl 3，Program Change 2
代码返回，
[[, <Event(34-Unknown {'status': 0, 'data1': 0, 'data2': 20, 'data3': 18, 'timestamp': 2248, 'vice_id': 3})>, <Event(34-Unknown {'status': 127, 'data1': 1, 'data2': 0, 'data3': 68, 'timestamp': 2248, 'vice_id': 3})>, <Event(34-Unknown {'status': 60, 'data1': 247, 'data2': 0, 'data3': 0, 'timestamp': 2248, 'vice_id': 3})>] 绞尽脑汁想知道如何将其转换为 Channel 3, PC 1 和/或 Channel 3, PC 2
有什么指导吗?
整个测试脚本，
导入pygame、pygame.midipygame.midi.init()pygame.init()计数 = pygame.midi.get_count()打印(有"，计数，MIDI设备")dev1 = pygame.midi.get_device_info(1)打印(1="，dev1)dev2 = pygame.midi.get_device_info(2)打印(2="，dev2)dev3 = pygame.midi.get_device_info(3)打印(3="，dev3)inp = pygame.midi.Input(3,100)打印(输入)为真:如果 inp.poll():# 无法找到队列中的消息数# 所以我们只指定一个高最大值#print (inp.read(1000))阅读 = inp.read(100)#打印(读取)转换 = pygame.midi.midis2events(read,3)打印(转换)# wait 10ms - 这是任意的，但 wait(0) 仍然产生# 在 100% cpu 利用率pygame.time.wait(10)好的，所以继续挖掘......
我发现我的踏板发出了大量与我正在做的事情无关的 MIDI 信息.现在，我已经安顿好了踏板，我收到了有意义的消息.
当我发送 Chnl 3 PC 1 程序更改消息时，
[<事件(34-未知{'状态':196，'数据1':0，'数据2':0，'数据3':0，'时间戳':3942，'vice_id':3})>;, <Event(34-Unknown {'status': 180, 'data1': 80, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>,<Event(34-Unknown {'status': 180, 'data1': 81, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>]
当我发送 Chnl 3 PC 1 2 get 时，
[<事件(34-未知{'状态':196，'数据1':1，'数据2':0，'数据3':0，'时间戳':3942，'vice_id':3})>;, <Event(34-Unknown {'status': 180, 'data1': 80, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>,<Event(34-Unknown {'status': 180, 'data1': 81, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>]
所以，三个事件"我只对 staus: 196 的事件感兴趣，因为那是 chnl 3.
我发现了这个，它揭示了这些 MIDI 消息，
[url]https://www.midimountain.com/midi/midi_status.htm[/url]
所以，现在我需要扫描这个长字符串中的'status': 196"；如果找到，则获取 data1 的值
如果有人有一种优雅的方式来做到这一点，我将不胜感激...
midis2events() 函数毫无意义，如果你不使用事件循环.
只需从您读取的数据中提取值:
<代码>...阅读 = inp.read(100)对于阅读中的事件:((status,data1,data2,data3),timestamp) = 事件如果状态 == 196:打印(f更改为程序 {data1}")My goal is to listen to a MIDI to USB adapter that is connected to my guitar pedalboard switcher. When a program change, (PC) message is received, play the appropriate mp2 file.
I've tried a number of different Python MIDI modules and pygame has got me the closest.
Below is the code I have been tinkering with and it is printing messages when I send program messages for the pedal switcher. I just do not know how to extract and interpret what I need.
For instance, the pedal switcher sends a PC message MIDI Chnl 3, Program Change 1
My code,
print (convert)
Returns,
<Event(34-Unknown {'status': 240, 'data1': 65, 'data2': 0, 'data3': 0, 'timestamp': 4674, 'vice_id': 3})>, <Event(34-Unknown {'status': 0, 'data1': 0, 'data2': 20, 'data3': 18, 'timestamp': 4674, 'vice_id': 3})>, <Event(34-Unknown {'status': 127, 'data1': 1, 'data2': 0, 'data3': 67, 'timestamp': 4674, 'vice_id': 3})>, <Event(34-Unknown {'status': 61, 'data1': 247, 'data2': 0, 'data3': 0, 'timestamp': 4674, 'vice_id': 3})>]
Or, MIDI Chnl 3, Program Change 2
Code returns,
[[<Event(34-Unknown {'status': 240, 'data1': 65, 'data2': 0, 'data3': 0, 'timestamp': 2248, 'vice_id': 3})>, <Event(34-Unknown {'status': 0, 'data1': 0, 'data2': 20, 'data3': 18, 'timestamp': 2248, 'vice_id': 3})>, <Event(34-Unknown {'status': 127, 'data1': 1, 'data2': 0, 'data3': 68, 'timestamp': 2248, 'vice_id': 3})>, <Event(34-Unknown {'status': 60, 'data1': 247, 'data2': 0, 'data3': 0, 'timestamp': 2248, 'vice_id': 3})>]
Scratching my head on how to translate that to Channel 3, PC 1 and/or Channel 3, PC 2
Any guidance out there?
Entire test script,
import pygame, pygame.midi
pygame.midi.init()
pygame.init()
count = pygame.midi.get_count()
print ("There are ", count, "MIDI devices")
dev1 = pygame.midi.get_device_info(1)
print ("1= ",dev1)
dev2 = pygame.midi.get_device_info(2)
print ("2= ",dev2)
dev3 = pygame.midi.get_device_info(3)
print ("3= ",dev3)
inp = pygame.midi.Input(3,100)
print(inp)
while True:
if inp.poll():
# no way to find number of messages in queue
# so we just specify a high max value
#print (inp.read(1000))
read = inp.read(100)
#print(read)
convert = pygame.midi.midis2events(read,3)
print (convert)
# wait 10ms - this is arbitrary, but wait(0) still resulted
# in 100% cpu utilization
pygame.time.wait(10)
Ok, so continuing to dig...
I found my pedalboard was spitting out a whole lot of MIDI messages that did not pertain to what I was doing. Now, I have the pedalboard settled down I'm getting messages that make sense.
When I send a Chnl 3 PC 1 program change message I get,
[<Event(34-Unknown {'status': 196, 'data1': 0, 'data2': 0, 'data3': 0, 'timestamp': 3942, 'vice_id': 3})>, <Event(34-Unknown {'status': 180, 'data1': 80, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>, <Event(34-Unknown {'status': 180, 'data1': 81, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>]
When I send a Chnl 3 PC 1 2 get,
[<Event(34-Unknown {'status': 196, 'data1': 1, 'data2': 0, 'data3': 0, 'timestamp': 3942, 'vice_id': 3})>, <Event(34-Unknown {'status': 180, 'data1': 80, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>, <Event(34-Unknown {'status': 180, 'data1': 81, 'data2': 0, 'data3': 0, 'timestamp': 3943, 'vice_id': 3})>]
So, three "Events" I'm only interested in events with staus: 196 as that is chnl 3.
I found this, which shed some light on these MIDI messages,
[url]https://www.midimountain.com/midi/midi_status.htm[/url]
So, now I need to scan this long string for "'status': 196" and if found grab the value of data1
If anyone has an elegant way of doing that, I would be much appreciative...
The midis2events() function is pointless if you are not using the event loop.
Just extract the values from the data you have read:
...
read = inp.read(100)
for event in read:
((status,data1,data2,data3),timestamp) = event
if status == 196:
print(f"change to program {data1}")
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